GUIDE TO NET ENERGY METERING.

Transcription

1 GUIDE TO NET ENERGY METERING

2 Welcome to Net Energy Metering As a Net Energy Metering (NEM) customer, you are helping Hawaii reach its clean energy goals. Your photovoltaic (PV) system should have been sized to offset a portion or all of your typical electricity use. As you continue to manage your household or facility s energy use, it is important to practice good energy conservation habits and understand factors that can impact the amount of electricity you produce and consume. Factors that can impact your energy consumption and bill include: WEATHER AND SEASONAL CONDITIONS During summer months when there are longer hours of sunlight, your PV system will likely generate more electricity compared to the winter months which tend to have overcast conditions and shorter daylight hours. Seasonal use of appliances or equipment, such as air conditioners, can also impact your electricity consumption. Monitoring and Maintenance PV systems, like any major appliance or equipment, require maintenance. Maintenance of your PV system s components is your responsibility or, in some cases, the responsibility of the PV contractor you hired. General maintenance is needed for the inverters, solar modules (panels), and wiring up to the utility meter. Periodic cleaning of the panel surfaces and checking of the operating systems will help to ensure that your system functions efficiently. Many contractors provide maintenance plans and services. Your electric utility (Hawaiian Electric, Maui Electric, or Hawaii Electric Light Company) is responsible for the utility meter and the wiring leading up to the weatherhead for delivering electricity to and from your house or facility. USE OF APPLIANCES The graph below shows annual energy use for a typical family of four and illustrates which items use the most energy and cost the most to operate. Most electricity is used for air conditioning, water heating, refrigeration, lighting, and home entertainment equipment. Concentrating on conserving energy for these uses first will yield the largest savings reward for your effort. Central Air Conditioning Room Air Conditioning Electric Hot Water Solar Hot Water Primary Refrigerator Second Refrigerator 1 1 Miscellaneous and Lighting Home Entertainment Equipment Television Electric Cooking Freezer Clothes Dryer Dishwasher Your usage may be different depending on your family size, household activities, as well as the type, number, and age of your appliances. Use energy more efficiently by checking out resources in the Energy Savings Toolkit at /Year Assumes the second refrigerator is an older, less energy efficient model. PV SYSTEM MONITORING Many solar systems come with a monitor or web portal to track your energy production. By monitoring the system s performance, you can ensure that it is working efficiently and keep track of how much energy is being produced. Your monitor will show more energy generated by your PV system than received by the utility NEM meter because energy you generate powers your electrical appliances and equipment first. Consult your solar contractor to learn more about PV system monitoring and maintenance. 2

3 Understanding Net Energy Metering NEM is a simple way to connect renewable energy systems 1 up to 1 kilowatts (kw) to the grid to offset part or all of your electricity purchases. With NEM, excess energy produced by your PV system and not immediately used by your household/facility is sent to the electric grid and credited to your account. The utility s grid backs up your PV system to ensure you are provided with electricity at night or on days when your use exceeds the amount produced by your PV system. When electricity is purchased by you from the electric utility, your NEM credit will be applied toward eligible energy charges. 1. Renewable energy systems eligible for NEM include solar, wind, biomass or hydro, or a hybrid system consisting of two or more of these systems. Cooling appliances or equipment such as refrigerators and air conditioners use a lot of electricity. Energy use will increase when they are set at cooler temperatures or used for longer hours. 2. From your inverter, the electricity produced by your PV system will power appliances and electronics first. PV SYSTEM Weather conditions such as cloud cover can impact the amount of solar energy your PV system is able to produce. On overcast days your PV system will produce less energy than on clear and sunny days. 1. Electricity produced by your PV system travels through your inverter. During the day, energy from the sun is captured by PV panels usually on the roof of your house/facility. Energy produced by your PV system is tracked by your inverters and should be checked regularly. WEATHERHEAD 4. If needed, additional electricity is delivered from the electric utility to your house/facility. Electric water heaters use a lot of electricity. You can cut your energy consumption by washing clothes with cold water and taking shorter showers. Replacing your electric water heater with a solar water heater can be an excellent investment. 3 INVERTER 3. Any excess electricity is sent to the electric utility. NEM METER If your PV system produces more electricity than you need at the time, the excess is sent to the electric grid and recorded by your NEM meter. The meter can only register electricity that passes through the metering point. For example, if your PV system produces 1 kw of electricity and your refrigerator uses 1 kw of electricty, no electricity will pass through the metering point. 4

4 How to Read Your NEM Meter A net meter is a bidirectional meter that registers the amount of electricity flowing to and from your house/facility. The electricity flow is tracked by three ID display codes (3, 33, 23) on the NEM meter. The difference between 3 and 33 is the net amount (23). ID 3: Energy DELIVERED to your house/facility from the electric utility ID 33: Excess energy RECEIVED by the electric utility from your PV system ID 23: Net Energy The following examples show how a NEM meter display might look: Example 1: The electric utility RECEIVED MORE energy than it DELIVERED to you. It is important to note that the CURRENT READING number noted on your bill is cumulative. Thus, to track the actual amount of energy RECEIVED by the utility company (REC KWH) and DELIVERED to you (DEL KWH) over each month, you will need to subtract the PREVIOUS READING from the CURRENT READING. Only the NET KWH reading may increase and decrease from month to month. This is shown on your bill in the BILL PERIOD section: REGISTER NET KWH DEL KWH REC KWH CURRENT READING 16. 3,145. 2,985. Example 2: The electric utility RECEIVED LESS energy than it DELIVERED to you. PREVIOUS READING 67. 2,668. 2,61. USAGE DELIVERED 24 RECEIVED 9 Net CREDITED 15 DELIVERED 125 RECEIVED 25 Net DEBITED The bar chart below illustrates this example: The bar chart below illustrates this example: DELIVERED 24 RECEIVED DELIVERED 125 RECEIVED 25 Net DEBIT 5 9 Net CREDIT Since your NEM meter cannot display negative numbers, 9 will be displayed as 9991 (1 9). 5 After your NEM meter has been installed, you may accumulate credit for excess energy produced by your PV system and received by the electric utility on a monthly basis. Credit from excess energy production is automatically applied to monthly bills within the 12month period when the amount of electricity you purchase exceeds the Minimum Charge. 6

5 Energy Production and Energy Use Energy Basics You can estimate your household or facility s total energy consumption by recording your PV system s output and the utility meter readings over the same time period. Then, follow this formula below: Net Energy + Total Energy Produced Total Energy Consumed Example 1: Your PV system PRODUCED MORE energy than you CONSUMED. NET ENERGY (DISPLAY 23) + Total energy produced (ON INVERTER) total energy CONSUMed Your PV system produced 325 and your house/facility only needed 235. Thus, the excess 9 will be credited to you for future use INVERTER DISPLAY Net CREDIT ENERGY CONSUMED 235 To better understand how these numbers relate to your energy consumption, below are common energy terms: Watts: A watt is the standard unit of measurement for electrical power. For example, if a compact fluorescent light (CFL) bulb with a power rating of 24 watts is turned on for one hour, the energy used is 24 watt hours. Kilowatts: A kilowatt is equivalent to 1, watts. Since we use large amounts of electricity at one time, electricity is often described in terms of kilowatts. 1 kw 1, W KilowattHours (): The number of kilowatts used in one hour. This unit of measurement is shown on your NEM meter. KilowattHours ()/Day: The average number of kilowatthours purchased from the electric utility per day during the billing period. This is calculated by dividing the total kilowatthours by the number of days in the billing period. Example 2: Your PV system PRODUCED LESS energy than you CONSUMED. NET ENERGY (DISPLAY 23) + Total energy produced (ON INVERTER) total energy CONSUMed Your PV system produced 325 but your house/facility needed 35. Thus, the additional 25 was purchased from the electric utility Net DEBIT INVERTER DISPLAY 325 ENERGY CONSUMED 35 8

6 Understanding Your NEM Bill Understanding how to read your electric bill will help you to manage your electricity use every month. Various sections of a sample bill are explained on the following pages. HOW YOU ARE BILLED: NEM customers are either charged a Minimum Charge or a nonenergy Customer Charge plus the net energy consumed from the electric utility. NEM credit will be applied toward eligible charges that exceeed the Minimum Charge in a given month during the 12month NEM billing cycle. ELEMENTS OF YOUR BILL ACCOUNT SUMMARY: This section shows the electric service billing period for the current bill and summarizes what is owed. Service Period: The dates you received electric service covered by the bill. Previous Balance: The amount that was due in your previous statement. Payments: The payment amount that was received by the electric utility toward paying your previous month s balance. Outstanding Balance: If you paid your last statement in full, this amount should be. However, if you missed a payment or were unable to pay your previous balance in full, the amount that you still owe will be noted here and added on to the TOTAL AMOUNT DUE for this billing period. Current Charges: The cost for electric service that was provided to you on the days covered in the Service Period. ACCOUNT SUMMARY (See Bill Detail section for more information) Service Period 8/2/12 Previous Balance Payments + OUTSTANDING BALANCE 8/31/12 $. Adjustments: If you have any fees or credits that can be applied, those amounts will be noted here. Total Amount Due: This is the total amount that you owe to the electric utility. A due date for this payment will be provided on your statement. Current Charges Adjustments Current Charges + $. + TOTAL AMOUNT DUE 9/24/212 BILL PERIOD: This section provides information related to your energy use as recorded by your NEM meter for the Service Period noted on your bill. DEL KWH: Energy DELIVERED to your house/facility from the electric utility REC KWH: Excess energy RECEIVED by the electric utility from your PV system NET KWH: The difference between energy DELIVERED and RECEIVED R Residential Service Signed NEM Contract METER# REGISTER CURRENT READING MPX9995 NET KWH 47. DEL KWH 2,24. REC KWH 2,157. BILLING KWH. NET GENERATION 36. BILL PERIOD PREVIOUS READING 83. 1,74. 1,657. FROM 8/2/12 TO 8/31/12 3 DAYS DIFFERENCE MULTIPLIER USAGE 36. x x x

7 Understanding Your NEM Bill USAGE PROFILE: This section shows your electricity use history over the past year. When your net meter is installed, your historical data will only show the readings that have been displayed on your new NEM meter. Your historical electricity use over the past 13 months is represented by an easytoread bar chart NET DEBIT ZONE: number of the electric utility delivered to your house or facility in excess of what your PV panels produced. NET CREDIT ZONE: number of the electric utility received from your house or facility and issued to your account as full retail credit. N E T K W H NET DEBIT ZONE NET CREDIT ZONE DATE: The ending date of a billing period USAGE PROFILE ELECTRIC USAGE PROFILE FOR METER MPX9995 DATE 1/31/12 1/1/12 8/31/12 8/1/12 6/29/12 6/1/12 1 4/3/12 3/3/12 3/1/12 1/3/12 12/3/11 11/3/11 1/31/11 NET DEL: The number of delivered to your house or facility DEL REC AMOUNT: The total cost for the delivered from the electric utility plus nonenergy charges AMOUNT $39.77 $16.89 $16.72 $25.46 $85.51 $93.68 $ $297. $ $ $ DAYS KWH/DAY: Your average daily electricity use KWH/DAY $/DAY NET: The NET number of consumed or generated REC: The number of received by the electric utility from your PV system DAYS: Number of days in the billing period, usually ranging from 2733 days $/DAY: Average daily cost for the amount of electricity you used in that period 1. As shown by the example above, a net meter installed in June began recording data in that billing cycle and monthly data is collected from this moment in time going forward. The concept of Net Zero is to have your annual NET DEBIT equal your annual NET CREDIT

8 Understanding Your NEM Bill BILL DETAIL: This section breaks down your total bill by individual charges. BILL DETAIL DESCRIPTION PREVIOUS BALANCE Incoming Payment on 1/11/212 Thank You Outstanding Balance CURRENT CHARGES Electric Service R Residential Service Signed NEM Contract Customer Charge * Base Fuel Energy Non Fuel Energy Energy Cost Adjustment ** IRP Cost Recovery PBF Surcharge Purchased Power Adjustment RBA Rate Adjustment NEM Credit Total for Current Charges Total Amount Due AMOUNT $9. $12.65 $7.54 $6.53 $.8 $.63 $2.98 $.36 $3.77 TOTALS $9. $9. * The Energy Charge (Column M, pg. 15) includes Base Fuel Energy and NonFuel Energy and varies by utility. ** Other Adjustments (Column O, pg. 15) includes IRP Cost Recovery, PBF Surcharge, Power Purchase Adjustment, and RBA Rate Adjustment. These charges also vary by utility. During months when your energy use falls in the Net Debit Zone and exceeds the Minimum Charge, previously accrued NEM Credit will be applied toward your current eligible energy use charges. Although your PV system may be sized to generate all of the electricity needed by your house/facility, remaining connected to the electric grid ensures you are delivered firm power from the electric utility at night when your PV system is not generating electricity and on days when your PV system does not generate enough electricity to meet your daily energy needs. NEM customers contribute toward some of the fixed costs of maintaining electrical service to their house/facility by paying a Customer Charge or Minimum Charge. NEM Credit cannot be applied toward these charges. Your bill will reflect a Minimum Charge during months you are a NET producer and accrue NEM Credit or when the amount of electricity purchased from the electric utility does not exceed the Minimum Charge. During months you are a NET consumer and purchase electricity from the electric utility in excess of the Minimum Charge, your bill will reflect available credit applied to eligible charges plus a Customer Charge. FUELRELATED CHARGES: Base Fuel Energy: This is the cost of fuel used in power plants to produce electricity. It also includes the cost of energy purchased from independent power producers. This charge is based on the fuel prices and purchased energy prices used in your electric utility s last completed rate case. NON FUELRELATED CHARGES: Non Fuel Energy: This charge covers some of the costs (excluding fuel) to provide electric service to you. These include costs to operate power plants and maintain the electrical system. IRP Cost Recovery: This allows the electric utility to recover the costs of its longterm energy planning process, Integrated Resource Planning (IRP), and the costs of certain energy management programs. PBF Surcharge: This surcharge collects funds that are used to pay for energy efficiency programs, including customer incentives such as rebates, to reduce electricity use in Hawaii. The programs are managed by a third party administrator, Hawaii Energy, reporting to the Public Utilities Commission (PUC). 13 Energy Cost Adjustment: This adjustment reflects increases or decreases in the cost of buying energy from independent power producers and in the price of fuel from the levels initially used to set the Base Fuel Energy Charge in your electric utility s last rate case. Purchased Power Adjustment: This applies to residential rate schedules, R, TOUR, TOUEV, and EVR. It recovers expenses and related taxes for nonenergy purchased power costs from independent power producers, which were formerly recovered through the NonFuel Energy Charge. RBA Rate Adjustment: the Revenue Balancing Account (RBA) Rate Adjustment, is a charge or credit approved by the PUC under a new method of setting electric rates called decoupling, which supports the electric utility s clean energy efforts. Interim Increase: This adjustment reflects any interim rate adjustments approved by the PUC. This item may not always appear on your bill. 14

9 Understanding Your NEM Bill Date This section summarizes the amount of energy the electric utility delivered to you, excess energy the electric utility received from your PV system, and the NET energy supplied or received for each billing period. This section also shows your accumulated NEM credit and balance. 6/1/212 6/29/212 8/1/212 8/31/212 1/1/212 1/31/212 Total 15 ENERGY DELIVERED: Display 3 on your NEM Meter Supplied by Company (A) ENERGY RECEIVED: Display 33 on your NEM Meter Received from NEM Customer (B) NET ENERGY: Display 23 on your NEM Meter Kilowatt Hours () When the electric utility DELIVERS more to you than it RECEIVES from your house/facility, these will be converted to charges shown in your Bill Detail section. Previously accrued NEM Credit can be applied toward eligible charges that exceed the Minimum Charge. Billing and Total Bill columns will show billable charges before any accrued credit has been applied. Date 6/1/212 6/29/212* 8/1/212 8/31/212 1/1/212* 1/31/212 Total Billing (K)(D) Total Bill (L) $25.46 $39.77 $ Net (CAB) Energy Charge (M) $8.35 $2.19 $28.54 for billing purchases (D) Eligible for a Refund Energy Cost Adjustments (N) $ $13.1 for Credit Calculation (E) Other Adjustments (O) $2.18 $4.5 $6.23 Previously accrued NEM Credit will be applied to any charges Eligible for a Refund that exceed the Minimum Charge which fall under the Energy Charge, Energy Cost Adjustments, and Other Adjustments columns. * Since the charges for purchasing electricity from the electric utility for these months did not exceed the Minimum Charge, NEM credit was not applied and the Minimum Charge ( in this example) was due. When the electric utility RECEIVES more from you than it DELIVERS to your house/facility, these will be converted to credit which can be applied toward future bills or previous months when the reconciliation is done for your 12month NEM billing cycle. Net Customer Generation Credit per month is the sum of the Energy Charge Credit, Energy Cost Adjustment Credit, and Other Adjustments Credit, which are based on your Net consumption. Energy Charge Credit (F) $1.35 $6.2 $16.37 Credit for Net Customer Generation Energy Cost Other Adjustment Adjustments Credit Credit (G) (H) $8.1 + $ $ $ $ $4.8 Net Customer Generation Credit/Month will be added to your Cumulative Credit Balance to be used toward charges Eligible for a Refund. In this example, $33.62 NEM Credit was available and $3.77 of the charges were Eligible for a Refund. Thus, $3.77 credit was applied, leaving a Cumulative Credit Balance of $2.85 ($33.62 $3.77). Credit Applied (P) $3.77 $3.77 Bill Refund Bill Net Of Credit (Q)(LP) $25.46 $9.** $11.59 Applied (R) $3.77 Net Customer Generation Credit/Month (J)sum(F:H) $21.31 $12.31 $33.62 Cumulative Credit Balance (S) $21.31 $33.62 $33.62 $2.85 Applied credits will be deducted from the previous month s Balance. During months you accrue NEM Credit or your use does not exceed the Minimum Charge, your bill will reflect a Minimum Charge to contribute toward some of the fixed costs of maintaining your electric service. Credit cannot be applied toward the Minimum Charge or Customer Charge. ** Since NEM credit cannot be applied toward the Customer Charge, the Customer Charge amount will appear on the Bill Net of Credit column. 16

10 Frequently Asked Questions If the electric circuit on my street already has a lot of PV systems connected, does this mean I can t install my system? When you submit a NEM application, the electric utility must first check that it is safe to add more PV to your local circuit and that the addition won t impact reliability for all customers on the circuit. For a small (1 kw or less) system, it is likely that the system can be installed without an Interconnection Requirements Study (IRS). On circuits with very high PV penetration and for larger systems, an IRS may be required before installation can be approved. Does it matter what month my NEM agreement starts? No. Over a 12month period, you will normally send more power to the electric grid than you receive in summer months and less in winter months. In most cases, a PV system sized to offset your annual average electricity consumption should balance out at the end of any 12 months. If you generate NEM credit, it will either be applied to eligible charges in subsequent months during the 12month period or to remaining eligible charges at the end of the 12month period when a credit reconciliation is done. Thus, the month your NEM agreement starts only impacts when your NEM credit will be applied during the 12month period. What happens if I still have unused credit at the end of my 12month period? If you have credit remaining at the end of your 12month period, you are eligible to get a refund for eligible energy charges you previously owed the electric utility within the 12month period. Any credit that remains after that will be forfeited. The refund will be shown as a credit adjustment on your electric bill. A PV system sized to offset your annual electricity consumption should have little or no credit remaining after the 12month reconciliation. Why does my PV monitor/inverter show that I generated more energy than the electric utility received? Your PV monitor/inverter measures all the energy your system generates. Most of that energy is consumed in your house/facility. The utility meter only measures the excess energy over what you ve already consumed. Contact Us Hawaiian Electric Company Customer Service Net Energy Metering Net Energy Metering Office Net Energy Metering Website Information Solar Information Maui Electric Company Customer Service, Maui Customer Service, tollfree Net Energy Metering Office, Maui ext Net Energy Metering Office, tollfree ext Net Energy Metering Net Energy Metering Website Information Hawaii Electric Light Company Customer Service, Hilo Customer Service, Kona Customer Service, Kamuela Net Energy Metering Office Net Energy Metering Website Information Additional Resources Database of State Incentives for Renewables and Efficiency Information on federal tax credits. Hawaii Department of Taxation Download the N342 form and instructions to see if you qualify for a state renewable energy tax credit. What if I want to add more capacity? If you have an executed NEM agreement with Hawaiian Electric and want to increase your capacity, you (or your contractor on your behalf) must submit a NEM Addendum application to the electric utility. Maui Electric and Hawaii Electric Light Company requirements may vary

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